High-strain-rate Property Determination of High-strength Steel Using Finite Element Analysis and Experimental Data
Open Access
Author:
Schreiber, Jeremy Michael
Graduate Program:
Engineering Science and Mechanics
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
April 01, 2013
Committee Members:
Ivica Smid, Thesis Advisor/Co-Advisor Timothy John Eden, Thesis Advisor/Co-Advisor Albert Eliot Segall, Thesis Advisor/Co-Advisor
Keywords:
Strain Rate Johnson-Cook 4340 Abaqus
Abstract:
There is a great deal of interest in the behavior of metallic materials under high strain rate loading. Finite Element Analysis (FEA) can be used to model these materials with a reduction in the amount of experimentation needed for characterization. High strain rate properties of materials are often difficult and expensive to obtain. There is a growing interest in the high strain rate behavior of metallic materials. A finite element model of a metallic ring under high strain rate loading was developed using the Johnson-Cook constitutive material model in Abaqus CAE. High strain rate properties of AISI 4340 and HF-1 steel were used for the analysis. The finite element model was coupled with the split Hopkinson pressure bar technique, along with a novel experimental method of characterization. The ring was modeled both axisymmetrically and in 3D to help ensure accuracy in results. Failure was determined by defining a failure strain to start the process of element deletion. Failure strain in the FEA was adjusted to induce failure in the ring. It was found that element deletion would occur when the failure strain was below 1x10-5.Results of both axisymmetric and 3D were found to be within 3% of each other with respect to maximum von Mises stress, and failure modes were identical. The effects of mesh type and defects are investigated.
